Tasos,
> This flash drive reports write protect during the first mode sense.
>
> In the past this was not an issue as the kernel called revalidate twice,
> thus asking the device for its write protect status twice, with write
> protect being disabled in the second mode sense.
>
> However, since commit 1e029397d12f ("scsi: sd: Reorganize DIF/DIX code to
> avoid calling revalidate twice") that is no longer the case, thus the
> device shows up read only.
>
> [490891.289495] sd 12:0:0:0: [sdl] Write Protect is on
> [490891.289497] sd 12:0:0:0: [sdl] Mode Sense: 2b 00 80 08
>
> This does not appear to be a timing issue, as enabling the usbcore quirk
> USB_QUIRK_DELAY_INIT has no effect on write protect.
That's very interesting. I received a couple of reports about USB
devices from other vendors that had a similar problems with WP but I
always assumed it to be a timing issue.
Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
--
Martin K. Petersen Oracle Linux Engineering
